Operando high-temperature near-ambient pressure X-ray photoelectron spectroscopy and impedance spectroscopy study of Ni−Ce0.9Gd0.1O2−δ solid oxide fuel cell anode

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Standard

Operando high-temperature near-ambient pressure X-ray photoelectron spectroscopy and impedance spectroscopy study of Ni−Ce0.9Gd0.1O2−δ solid oxide fuel cell anode. / Kooser, Kuno; Käämbre, Tanel; Vestli, Mihkel; Joost, Urmas; Urpelainen, Samuli; Kook, Mati; Bournel, Fabrice; Gallet, Jean Jacques; Lust, Enn; Kukk, Edwin; Nurk, Gunnar.

I: International Journal of Hydrogen Energy, 08.08.2020.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

APA

CBE

MLA

Vancouver

Author

Kooser, Kuno ; Käämbre, Tanel ; Vestli, Mihkel ; Joost, Urmas ; Urpelainen, Samuli ; Kook, Mati ; Bournel, Fabrice ; Gallet, Jean Jacques ; Lust, Enn ; Kukk, Edwin ; Nurk, Gunnar. / Operando high-temperature near-ambient pressure X-ray photoelectron spectroscopy and impedance spectroscopy study of Ni−Ce0.9Gd0.1O2−δ solid oxide fuel cell anode. I: International Journal of Hydrogen Energy. 2020.

RIS

TY - JOUR

T1 - Operando high-temperature near-ambient pressure X-ray photoelectron spectroscopy and impedance spectroscopy study of Ni−Ce0.9Gd0.1O2−δ solid oxide fuel cell anode

AU - Kooser, Kuno

AU - Käämbre, Tanel

AU - Vestli, Mihkel

AU - Joost, Urmas

AU - Urpelainen, Samuli

AU - Kook, Mati

AU - Bournel, Fabrice

AU - Gallet, Jean Jacques

AU - Lust, Enn

AU - Kukk, Edwin

AU - Nurk, Gunnar

PY - 2020/8/8

Y1 - 2020/8/8

N2 - In this study we present the results of operando high temperature near-ambient-pressure x-ray photoelectron spectroscopy (HT-NAP-XPS) measurements of a pulsed laser deposited thin film Ni−Ce0.9Gd0.1O2−δ model electrode. In our measurements, we have used the novel three electrode dual-chamber electrochemical cell developed in our previous work at different H2 pressures and at different electrochemical conditions at around 650 °C. The possible redox reactions on the anode surface (Ni2+↔Ni0,Ce4+↔Ce3+) were investigated by HT-NAP-XPS technique simultaneously with electrochemical impedance spectroscopy measurements. The oxygen partial pressure in counter and reference electrode compartment was controlled at 0.2 bar. Changes in electronic structure of the Ce3d and Ni2p photoelectron spectra caused by electrode potential and H2 pressure variations were observed and estimated by curve fitting procedure. The O1s and valence band photoelectron signals were used for depth probing of the chemical composition and redox changes at Ni-GDC and for studying the influence of the electrochemical polarization on the chemical state of Ni-GDC surface atoms. As a result changes in oxidation state of electrode surface atoms caused by electrode polarization and oxide ion flux through the membrane were detected with simultaneous significant variation of electrochemical impedance.

AB - In this study we present the results of operando high temperature near-ambient-pressure x-ray photoelectron spectroscopy (HT-NAP-XPS) measurements of a pulsed laser deposited thin film Ni−Ce0.9Gd0.1O2−δ model electrode. In our measurements, we have used the novel three electrode dual-chamber electrochemical cell developed in our previous work at different H2 pressures and at different electrochemical conditions at around 650 °C. The possible redox reactions on the anode surface (Ni2+↔Ni0,Ce4+↔Ce3+) were investigated by HT-NAP-XPS technique simultaneously with electrochemical impedance spectroscopy measurements. The oxygen partial pressure in counter and reference electrode compartment was controlled at 0.2 bar. Changes in electronic structure of the Ce3d and Ni2p photoelectron spectra caused by electrode potential and H2 pressure variations were observed and estimated by curve fitting procedure. The O1s and valence band photoelectron signals were used for depth probing of the chemical composition and redox changes at Ni-GDC and for studying the influence of the electrochemical polarization on the chemical state of Ni-GDC surface atoms. As a result changes in oxidation state of electrode surface atoms caused by electrode polarization and oxide ion flux through the membrane were detected with simultaneous significant variation of electrochemical impedance.

KW - EIS

KW - NAP-XPS

KW - Ni-GDC

KW - Operando

KW - Solid oxide fuel cell

KW - Surface chemistry

U2 - 10.1016/j.ijhydene.2020.06.228

DO - 10.1016/j.ijhydene.2020.06.228

M3 - Article

AN - SCOPUS:85089195308

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 1879-3487

ER -